<!DOCTYPE html>
<html>
	<head>
		<meta charset="UTF-8">
		<title></title>
	</head>
	<body>
		<script>
			var jijie=prompt("请输入月份");
			if(jijie<=3&&jijie>=0){
				alert("现在是第一季度");
			}else if(jijie<=6&&jijie>=0){
				alert("现在是第二季度");
			}else if(jijie<=9&&jijie>=0){
				alert("现在是第三季度");
			}else if(jijie<=12&&jijie>=0){
				alert("现在是第四季度");
			}else{
				alert("请输入月份好吗？");
			}
		</script>
	</body>
</html>
